Question

Why do lanthanoids not possess much tendency to form complexes?

Answer 1

1. The large size of lanthanoid ions lowers electrostatic attraction, reducing complex formation.
2. Lanthanoids have unavailable 4f orbitals for hybridization, resulting in weak covalent bonding.
3. Their high electropositive nature limits complex formation with π-bonding ligands.
4. They mainly form complexes with chelating ligands, but less readily than transition metals.